Detachable electric-plug fitting



Dec, 18,1928.

H. HERTZBERG DETAGHABLE ELECTRIC PLUG FITTING Filed Aug. 11. 1926 Ma F... &3 H 6 M H 2 WM 6 2 a w 2 0 w H L 5 2 M M H k 0 2 2 Z F 2 d w m H INVENTOR.

' BY f ATTORNEY).

Patented Dec. 18,

siren/stares 1,695,847 aren't lorries.

HARRY Hnn'rzBE G, or BROOKLYN, NEW YORK, AssrenoR TO Mortars snow, or

" EW YORK, N. Y.

'DETACHABL'E ELECTRIC-PLUG FITTING.

Application filed August 11, 1926. Serial No. 128,544.

This invention relates to detachable electrlc plug fittings.

Qne ob ect of the invention is the provision of an improved switch type, multiple lamp A. further object of the invention is to provide a levertype switch of improved con struction for selectively controlling. each socket of a multiple socket, plug fitting of the character described.

' A still furtherobject of the invention is to provide a littin of the character described including an improved lever operating switching mechanism comprising few and simple parts which-may be quickly andeasily assembled, which shall be comparatively cheap to manufacture yet neat and attractive in appearance, and practical and efficient in operation to a high degree. v

Other objects of this inventionwill in part be obvious and in part hereinafter pointed out. i Q

The inventionaccordingly consists in the features of construction, combinations of elements, and arrangement ofpa'rts which will be exemplified in the constructionhereinafter described, and of whiclrthe scope of application will be indicated in the following claim. i i I In the accompanying drawing, in which is shown one of the various possible illustrative embodiments of this invention,

Fig. l is across-sectional view taken on line 11 in 3, showing the interior construction ofan improved lever-switch type,

duplex lamp-socket, plug fitting embodying the invention. Y

Figs. 2 and 3, respectively, are front elevational and bottom plan Views of the imgn-oved fitting. 5

Referring in detail to the drawing, denotes a duplex electric lamp-socket, plug fitting embodying the invention. Said fitting is seen to comprise a plug 11 made preferably of moldedinsulating material and provided with a central contact 12, said. plug being connected toand supporting the other parts forming the littingin a 'manner hereinafter described. i

The contact 12 comprises a-screw 13, the

shank end 13 of which is threaded and projected through a central bore 1? in the plug, and a conical washer plate let. The latter is held'in position in a suitable recess formed in the head end of the plug 11 by means of the screw head 18", as is clearly shown in Fig. 1. The threaded shank end l3 extends into and is'ancho'rcd to the body portion of I the fitting 10, as shown in Fig. 1, and as will hereinafter be more fully described.

A shell 15 preferably made of sheet metal which forms'an outer contact for the plug 11,

is fitted over the latter from a point spaced rrom its outer end and 1s provided with a series ofl-ips 1W projecting inwardly against the bottom of the plug, said shell 15 also having integrally formed spaccd-lugslG and 17 extending between diametrically disposed lipsl5"; The lugs 16 and 17 have one end of conducting members 18- and 19 preferably formed of springy material, connected thereto in any suitable manner, as by means of an eyelet rivet 20, the free ends 18 and 19, re-

spectively, of said members being bent to form central spring contact members for two metallic, shell sockets 21 and 22.

The inner ends of said shells 21 and 22 are provided with lips 21 and 22" which lit.-

against ledges 31 and 32, respectively, formed on said. body portion; sections 26 and 2 7, re-

spectively, for retaining said. shells against rotaryv movement with respect to the body portion. .A projecting ledge is alsoprovided on the side of said sections-abutting the inner end of the plug 11 for engaging with the latter and lips 15 of the shell 15 to hold said plug and shell against rotary movement with respect tothc body portion.

The-shell. sockets 21 and 22 are positioned in spaced relation. to extend divergingly with respect to the plug 11 and are adapted to re -ceive the usual screw base (not shown) of For controllin the clrcuit from the )lug h l c) to each of said sockets, a lever control switch S is prov1'ded. Said switch comprises a conductor member 23 made of s rin v material bentyto have alooped end 23 the bight portionof which the threaded end. 13 of the shank of screw member 1.3, and is seem-ed loo thereto by a nut 24. The free end portions 23 and 23 of the conductor member 23 are bent away from each other and normally extend along and are spaced from the outer side of the screw shells 21 and 22, respectively, as is shown in full lines in Fig. 1. Mounted between said end portions 23" and 23 there is a lever 25 which is adapted to have its inner end 25 engage said portion 28 for forcing it into contact with the shell socket 22, as is clearly shown in dotted lines in Fig. 1.. V For enclosing, spacing and insulating the various parts described above, an insulating casing or body portion is provided comprising two similar sections or halves 26 and 27. Each section of the casing is perforated to receive suitable stening means, such as bolts 28 and 29 for holding the elements forming the fitting 10 assembled, the bolt 28 prefer-- ably passing through the loop portion 23 of the member and the bolt 29 serving as a pivotal support for the lever 25. Hollow branch portions and 26 and 27 and 2'?" of the sections 26 and 2?, respectively, which when the fittin is assembled enclose the shell sockets s1 and 22, are preferably made with grooves 30 on the interior sides thereof adjacent the end thereof to receive the outwardly flared rims 21 and 22 of the shells 21 and 22, respectively, for rigidly retaining said shells against longitudinal movement in the body portion.

The section 2"? is provided with a slotted portion 27 to permit limited movement of the handle end 25 of the lever 25 in the direction indicated by the arrow, (see Fig. 1), from a normally vertical off position shown in full lines to an on position on the dotted line position. The abutment wall 27 of portion 2'? serves as a stop to prevent movement of said lever handle end 25 to the right.

The switching mechanism S described above is eifective to control only the circuit connection from the plug 11 to the socket 22 independently of the circuit to the socket 21.. For the latter, a similarly constructed switch control means is provided, said means including a lever 125 positioned alongside the lever 25 and pivoted on the bolt 29. Said lever 125 like lever 25 is adapted for limited'movement in a slotted portion 26 from a normally vertical off position, against the abutment wall 26, to an on position when moved in the direction indicated by the arrow in Fig. 3. The movement of the lever handle end 125 to the on position is effective to spring the end portion 23* against the shell 21 in a manner similar to that described above for the lever 25 and the end portion 23, and as shown in 1 in dotted lines. The lever handle ends 25 and 125 are preferably formed with finger grips extending in opposite directions to facilitate independent and selective operation of the switch controls for the sockets 21 the members 18 and 19 therein so that the spring ends 18 and 19 of said. members forming the central contacts for the sockets 21 and 22, respectively, are not l kely to be strained or broken when a base of a bulb or an attachment plug is screwed into said sockets, the,

members 18 and 19 freely flexing within the grooves to afford effective springcontact engagement in sockets without straining.

1t to e understood that the detailed construction shown in the drawing and described above of the means for securing the sections and parts of the fitting 10 together may be varied, but the construction shown anddescribed greatly expedites assembly of the fit-- ting 10, the current carrying members being accommodated in complementary grooves I 1w; med in the sections in which they may be U simply placed and the sections and parts secured together to form a rugged fitting constructed to withstand rough usage and yet afford a neat and attractive appearance to the device as a whole.

It will thus be seen that there is provided a device in which the several objects of this invention are achieved, and which is well adaptedto meet the conditions of practical use.

As various possible embodiments might be made of the above invention, and as various changes might be made in the embodiment above set forth, it is to be understood that all matter herein set forth or shown in the accompanying drawing is to be interpreted as illustrative and not in a limiting sense;

Having thus described my invention, 1 claim as new and desire to secure by Letters Patent In an electric fitting, spaced current carrying receptacles, an electric switching mechanism mounted. between said receptacles, said mechanism comprising a looped member having spring contact ends, each end being normally spaced from one of said'receptacles, and a pair of levers positioned between said ends arranged so that each lever may be independently operated to flex one ofsaidends for contacting with a receptacle.

In testimony whereof I afiiX my signature.

HARRY rinn rznnns.

Said grooves 35 and 86 are preferably. 

